Sean “Diddy” Combs has hired an etiquette coach to teach his Bad Boy staff how to hold wine glasses and chopsticks, among other social niceties. The music mogul recently tapped Dawn Bryan to give staff at his Manhattan-based Bad Boy Records a course on proper dining etiquette, business protocol in foreign countries and other rules of conduct. Bryan, the author of “The Art and Etiquette of Gift Giving,” calls herself an “international protocol expert.” She recently taught Combs’ cohorts lessons including use of dinnerware at formal events, how to hold chopsticks and how to present a business card in Japan, guidance on giving business gifts and how to choose wine, hold a wine glass and eat caviar. A rep for Bad Boy said the lessons were part of a series of training sessions for employees at the company’s Midtown offices that are “a protocol for new hires.”